There are product roadmap webinars every now and then, but as they are plans and not definite to be completed and also sort of trade secrets those webinars are not recorded. There are product previews in the customer validation community where there is usually future plans included. You should catch future events of either type and watch.
On the other hand once GA the level of secrecy is dropped. For 15.6 and maybe a little on future versions see
[REPLAY] What's New in CA Clarity PPM 15.6 – March 21, 2019
or Rego's webinar
What’s New in Clarity PPM (CA PPM) 15.6 - Webinar
See
Clarity PPM Product Management Customer Engagement.pdf
for other options